Where are you riding that you think you need a 2000 lumen headlight? If you use that kind of thing on the street or bike path, it's just going to annoy anyone coming at you. How far up the road do you need to see at 15-20MPH?

I ride a little after 4AM 2-3 days a week with a 40 dollar light off Amazon and it works just fine for me whether in town or the surrounding areas with no streetlights or any other lighting. When it's dark you don't really need much light to see far enough ahead to be able to react to it. Same is true for tail lamps. Just about anything can be seen at night for a long way. It's the daytime when you need the super bright lights.